PLEASE ANSWER ASAP WILL GIVE BRAINLIEST! In "The White Umbrella," which event causes the narrator and Mona to have to wait for their mother at the piano teacher's house?

Their mother losing track of time while concentrating on her work.

Their mother is in a car accident that prevents her from arriving on time.

Their mother is promised a promotion if she stays late at work.

Their mother delivers flowers as her job and must fill many orders.